Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual Multiplicador de Clock possui um Número de Modelo de c7-m 764?
 ###Tabelas: CREATE TABLE regular_and_capital_gains_tax_rates_for_2009 (regular_and_capital_gains_tax_rates_for_2009_id AUTO_INCREMENT PRIMARY KEY, Ordinary income rate VARCHAR, Long-term capital gain rate VARCHAR, Short-term capital gain rate VARCHAR, Long-term gain on commercial buildings* VARCHAR, Long-term gain on collectibles VARCHAR) CREATE TABLE standard-voltage_90_nm (standard-voltage_90_nm_id AUTO_INCREMENT PRIMARY KEY, Model Number VARCHAR, Clock Speed VARCHAR, L2 Cache VARCHAR, FSB Speed VARCHAR, Clock Multiplier VARCHAR, Voltage Range VARCHAR, Socket VARCHAR, Release Date VARCHAR) CREATE TABLE selected_statistics (selected_statistics_id AUTO_INCREMENT PRIMARY KEY, College VARCHAR, 2007 Headcount INT, 2007-2008 credit hours INT, County population 18 yrs+ INT, Penetration in terms of Enrollment per 1000 adults INT, In-county tuition per credit hour (fall 2009) VARCHAR) CREATE TABLE 2013_season (2013_season_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Year INT, Opponent VARCHAR, Passing yards INT, Rushing yards INT, Total offense INT) CREATE TABLE farm_to_market_roads (farm_to_market_roads_id AUTO_INCREMENT PRIMARY KEY, Route Name VARCHAR, Direction VARCHAR, Termini VARCHAR, Junctions VARCHAR, Length VARCHAR, Population Area VARCHAR)  
SELECT Clock Multiplier FROM standard-voltage_90_nm WHERE Model Number = c7-m 764